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The common way to create ceramic honeycombs is extrusion molding, which involved mixing raw materials, extruding, drying, and firing to make the product [11]. The ceramics, binder, plasticizer, and lubricant are mixed into the pug and then uniformly mixed in a stirrer.
What is a honeycomb ceramic?
The ceramic honeycomb is the last three decades the development of a structure like honeycomb shape a new type of ceramic products. Ceramic honeycomb must be to reduce the coefficient of expansion and increase the number of holes per unit area.
What is DPF honeycomb made of?
Diesel Particulate Filters are made of a porous ceramic honeycomb of alternate end closed channels. The exhaust gas enters the DPF and passes through the porous walls of these channels and traps the particulate matter. Particulate matter (or PM) in the DPF is made up of soot and ash.
What is ceramic honeycomb used for?
Ceramic honeycombs are widely used as catalyst supports and as particulate filters for vehicular emission control. New geometries and materials have been developed for both mobile and stationary applications.
Why is platinum coated on a ceramic honeycomb?
Platinum group metals as catalytic converters Inside the converter, the gases flow through a dense honeycomb structure made from a ceramic and coated with the catalysts. The honeycomb structure means the gases touch a bigger area of catalyst at once, so they are converted more quickly and efficiently.
How is ceramic honeycomb made?
The common way to create ceramic honeycombs is extrusion molding, which involved mixing raw materials, extruding, drying, and firing to make the product [11]. The ceramics, binder, plasticizer, and lubricant are mixed into the pug and then uniformly mixed in a stirrer.
What is in Honeycomb?
Honeycombs are made from beeswax, a substance created by worker bees. When the temperature is right, worker bees secrete wax scales from special glands in their body. Then they chew the wax with a bit of honey and pollen to produce the beeswax.
Why does a catalytic converter have a honeycomb structure?
The interior of the ‘cat’ is usually filled with a honeycomb structure onto which a coating is applied that contains a catalyst – the substance that creates a reaction with the exhaust gasses, changing their chemical structure.
What type of structure is a honeycomb?
A honeycomb is a mass of hexagonal prismatic wax cells built by honey bees in their nests to contain their larvae and stores of honey and pollen.
What is the material inside a catalytic converter?
The catalyst component of a catalytic converter is usually platinum (Pt), along with palladium (Pd), and rhodium (Rh). All three of these platinum group metals, or PGMs, are extremely rare but have a broad range of applications in addition to catalytic converters.
What 2 primary sensors does the PCM use to check the catalytic converter?
The catalyst efficiency monitor verifies that the catalytic converter is operating at a high enough efficiency rating to keep exhaust emissions within the predetermined values. The PCM compares the signals from the upstream and downstream oxygen sensors to determine the state of the converter.
Why do they use platinum in catalytic converters?
Standard issue on cars in this country since the mid-1970s, catalytic converters use a small amount of platinum to convert harmful engine emissions, including nitrogen oxides and carbon monoxide, into less harmful ones, like nitrogen and carbon dioxide.
Why is platinum used as a catalyst?
Platinum works as a catalyst by collecting oxygen atoms (O), and letting them bind with the toxic carbon monoxide (CO), to create the less harmful carbon dioxide (CO2). The researchers discovered that the oxygen atoms are somewhat “loose,” so that they can easily react with other substances.
Why is platinum used in car exhaust?
The role of platinum in catalytic converters is to oxidise carbon monoxide (CO) and hydrocar- bons. The three-way catalyst used for petrol vehicles must also be able to reduce NOx to nitrogen as well as oxidise CO and hydrocarbons – that is why rhodium is generally used in addition to platinum or palladium.
How much is a used catalytic converter worth?
Metal/Material Current Price Exotic Cat Exotic catalytic converters are from foreign cars. GET QUOTE VIEW METAL DETAILS $543.00/each High Grade Domestic Cat Off domestic cars. GET QUOTE VIEW METAL DETAILS $154.00/each Pre-Domestic Cat Pre-Domestic Cat. GET QUOTE VIEW METAL DETAILS $32.00/each.
Is it OK to eat the honeycomb?
Honey in the comb, pure and simple. And yes, the comb is totally safe to eat. People have been keeping bees — and eating the honeycomb — for several thousand years. The comb itself — a network of hexagonal cylinders — is made from waxy secretions of worker bees.
Is honeycomb healthy to eat?
Honey and its comb are edible and offer numerous health benefits, such as fighting infections and improving heart health. Honeycomb may also boost liver function and serve as a sugar alternative for people with diabetes. That said, honeycomb remains rich in sugars, so should be consumed with moderation.
Is honey bee vomit?
Technically speaking, honey is not bee vomit. The nectar travels down a valve into an expandable pouch called the crop where it is kept for a short period of time until it is transferred to a receiving bee back at the hive.
Do all catalytic converters have honeycomb?
Some catalytic converters are full of honeycomb, but they have no precious metals that are lining the ceramic of metal comb. This will also lead to a no value catalytic converter and if it is just a shell or small remnants of material you will have much lower pricing if not steel value only.
What are the most stolen catalytic converters?
45 converters stolen since January in Salisbury It should be noted that the Toyota Prius leads the nation in catalytic converter thefts. Car experts say since the Prius is a hybrid, the catalytic converter corrodes less than on other cars, keeping the precious metal coating in better shape.
Is a beehive honeycomb a frame structure?
A hive frame or honey frame is a structural element in a beehive that holds the honeycomb or brood comb within the hive enclosure or box. The hive frame is a key part of the modern movable-comb hive.Hive frame. A frame covered with comb and bees Classification Beekeeping Manufacturer various.
What is the structure of a bee hive?
The nest’s internal structure is a densely packed group of hexagonal prismatic cells made of beeswax, called a honeycomb. The bees use the cells to store food (honey and pollen) and to house the brood (eggs, larvae, and pupae).
What is honeycomb in concrete structure?
Honeycomb is the rough pitted surface or voids in concrete formed due to improper compaction or incomplete filling of the concrete. Honeycomb is a serious problem of concrete that should be treated carefully. Otherwise, the structure or member may lose its strength.
